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Preheat oven to 350 degrees.
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For cake, cream butter and sugar in a large bowl until fluffy.
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Add eggs beating until smooth.
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In medium bowl, combine flour, baking powder, and salt.
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Gradually add dry ingredients to creamed mixture, blending well.
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Gently fold in sour cream and vanilla.
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Combine topping ingredients in small bowl, set aside.
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For chocolate glaze, melt chocolate chips and butter in small saucepan over low heat, stirring until smooth.
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Sprinkle 2 Tbl. topping in bottom of greased and floured 9" tube pan.
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Spoon half of the cake batter into pan.
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Sprinkle 4 Tbl. topping over cake batter.
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Drizzle half of glaze over topping.
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Spoon remaining batter into pan.
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Sprinkle with remaining topping.
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Reserve remaining glaze.
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Bake 1-1 1/4 hours or until a toothpick inserted in center of cake comes out clean.
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Cool in pan.
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Transfer to a serving plate.
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Reheat remaining glaze and drizzle over cake.